"Stirn'sche Patent Kamera" made 1886-1888, with company insignia, camera number No 7689 and patent number DRP 38391 engraved on back with company insignia.One of the oldest spy cameras, this model was produced in Rudolf Stirn's small Berlin factory between 1886 - 1888 (10,000 cameras made). The camera was worn inside a vest, the lens being small enough to fit through a button hole. Pictures were then taken by pulling a thin thread attached to the shutter. - With: Album entitled: Sommer 1888 containing 76 round photographs taken using this camera showing views of Hamburg, some portraits and a short ship trip. - Camera in working order, some surface corrosion spots and surface rubbing on back, otherwise in very good condition.